[HÌNH 8]nếu giỏi thử vào.

P

phantommoon

Last edited by a moderator:
C

ctsp_a1k40sp

[TEX]\frac{OM}{AB}=\frac{OD}{BD}=1-\frac{OB}{BD}=1-\frac{BN}{BC}=\frac{CN}{BC}=\frac{ON}{AB}[/TEX]



nên [TEX]OM=ON[/TEX]
 
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